17. Bar diameter for external threads (for cutting type dies) Production data ■Sewing machine screw threads (for 2nd class) Unit : mm Size major diameter of external threads bar diameter dmax dmin (ref.) 1/16 SM 80 1.588 1.518 1.54 5/64 SM 64 1.984 1.904 1.92 3/32 SM 56 2.381 2.286 2.31 3/32 SM 100 2.381 2.306 2.32 1/8 SM 40 3.175 3.045 3.08 1/8 SM 44 3.175 3.055 3.09 9/64 SM 40 3.572 3.442 3.47 11/64 SM 40 4.366 4.236 4.27 3/16 SM 24 4.762 4.602 4.64 3/16 SM 28 4.762 4.602 4.64 3/16 SM 32 4.762 4.602 4.64 7/32 SM 32 5.556 5.396 5.44 15/64 SM 28 5.953 5.773 5.82 1/4 SM 24 6.350 6.170 6.22 1/4 SM 40 6.350 6.220 6.25 ・from table 2 JIS B 0226 (void in 2001) ■Taper pipe threads (PT, R) Unit : mm ■Parallel pipe threads (PF G)(for A class) Unit : mm Size bar diameter (ref.) Size major diameter of external threads bar diameter taper (dia of thread end) Straight dmax dmin (ref.) PT 1/16 - 28 7.5 7.9 PF 1/16 - 28 7.723 7.509 7.56 PT 1/8 - 28 9.5 9.9 PF 1/8 - 28 9.728 9.514 9.57 PT 1/4 - 19 12.8 13.4 PF 1/4 - 19 13.157 12.907 13.0 PT 3/8 - 19 16.3 16.9 PF 3/8 - 19 16.662 16.412 16.5 PT 1/2 - 14 20.5 21.3 PF 1/2 - 14 20.955 20.671 20.7 PT 3/4 - 14 25.9 26.8 PF 5/8 - 14 22.911 22.627 22.7 PT 1 - 11 32.7 33.7 PF 3/4 - 14 26.441 26.157 26.2 PT 1 1/4 - 11 41.2 42.3 PF 7/8 - 14 30.201 29.917 30.0 PT 1 1/2 - 11 47.1 48.2 PF 1 - 11 33.249 32.889 33.0 PT 2 - 11 58.7 60.1 PF 1 1/8 - 11 37.897 37.537 37.6 PF 1 1/4 - 11 41.910 41.550 41.6 PF 1 1/2 - 11 47.803 47.443 47.5 PF 2 - 11 59.614 59.254 59.3 Technical Information Technical-49 820